Saw-mill dog



(No Model.)

B. LANDIS.

SAW MILL DOG.

Patented May 31, 1887.

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- NITED STATES PATENT OFFIC ABRAHAM B. LANDIS, OF FAYNESBOROUGH, PENNSYLVANIA.

SAW-MILL DOG.

SPECIFICATION forming pzirt of Letters Patent N0. 363.831.-dated May 31, 1887.

Application filed January 2-3, 1387. Serial No. 225,138. (No model.)

To all whom it may concern.-

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States, residing at \Vaynesborough, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Saw-Mill Dogs, of which the following is a' specification, reference being had therein to the accompanying drawings.

My invention relates to that class of sawmill dogs in which the dog or hookjs arranged in a sliding head which is adjusted by means of a lever and a pinion traveling upon a vertical rack secured to the side of theknees of a log-carriage.

The invention consists in combining with the rack, its sliding head, and pinion a leverhead firmly pivoted upon the axle of the pinion, and a hand-lever loosely retained in said lever-head, and having its extremity adapted to enter between the teeth of the pinion to turn it.

The invention will first be described in connection with the drawings, and then be specifically pointed out in the claims.

In the drawings, Figure 1 is a side view of a portion ofa knee having a dog-carrying head and means to operate it constructed in accordance with my invention. Fig. 2 is a vertical section of the same, taken on line 0000 of Fig. 1. Fig. 3 is a horizontal section on line 3 y of Fig. 2. Fig. 4 is a vertical section, upon a larger scale, of the lever-head of the device.

The dog or hook A is secured, as usual, in the head 13 by means of the pin 0 entering one of the holes a in the dog, aspiral spring being placed in the boss 0 through which it passes. The head B is provided with lateral projections b close to its inner surface, to enter ver-' tical grooves f in the interior of the knee F on each side of the rack f formed therein upon one side of said knee. The head Bis nearly its whole length made the same width as the side of the knee, and its front. edge, I)", is planed off so as to make an even surface with the front a of the knee, so that when a board is secured by the dog it will bear squarely against the surfaces 0; b, and the.

springing of the board is prevented. The head B has projecting from its side two semicircular checkpicccs, B provided with bosses B that form the bearings for the pin 1), upon which is mounted the head D of the handlever E, and also the pinion 0, having a circular row of teeth or cogs to engage with the teeth of the rack. The lever E is inserted in the head D from the inside, and to preventits coming off and at the same time form broad bearing-surfaces against the pinion and against take lodgment upon either one of the shoulders d as a fulcrum, to prevent disengagement from the pinion when said pinion is rotated to either elevate or depress the head 13 and thedog A, carried thereby, but when the lever E is to be disengaged from the pinion it is drawn back and its projections 6 enter into the bottom of the recess d.

Having now fully described my invention, I claim- .1. The combination of the knee F, having internally a rack and vertical grooves on each side thereof, the head B, having lateral proj ections to entersaid grooves, a circular pinion, a'lever-head having internal recesses, d, and shoulders d on the sides thereof, with a lever, E, having a tongue and lateral projections thereon, substantially as and for the purpose 7 described.

2. The combination of the knee F, the head B, connected therewith, as set forth, a circular pinion, a pivot-pin therefor, a lever-head having circular journal-bearings fitting upon said pin, a tapering opening in said head, recesses d, and shoulders d on the sides thereof, with a lever having lateral projections adjacent its inner end, substantially as and for the purpose described.

3. The combination of the knee F, having a planed front edge, a", the head 13, connected therewith, as set forth, and having its,front In testimony whereoflaffi x my signnturein edge, I), planed even with the front edge of presence of two witnesses. the knee, a pivot-pin passing through said head, a circular pinion thereon, a lever-head ABRAHAM B. LANDIS. '5 having circular perforations receiving the pivot-pin and having recesses d, and shoulders Vitnesses:

dflwith alever having lateral projections, sub- 0. E. BESORE,

stantially as and for the purpose described. 1). M. G001), Jr.- 

